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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106601] __builtin_bswap16 code gen could be improved
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Date: Fri, 12 Aug 2022 20:53:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106601

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-08-12

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Waterman from comment #1)

> (I don't know whether bswap32 has already been similarly optimized on RV6=
4,
> but it needs to use srai so that the 32-bit result is canonicalized
> properly.)

It is:
t:
        rev8    a0,a0
        srai    a0,a0,32
        ret
For:
unsigned int t(unsigned int a)
{
  return __builtin_bswap32(a);
}=